On Wed, Sep 08, 2021 at 01:43:28PM +0200, Christoph Lameter wrote: > ROCE uses IGMP for Multicast instead of the native Infiniband system where > joins are required in order to post messages on the Multicast group. According to the IBTA v1.5, there is no need to join multicast group to send messages. 10.5.2 MULTICAST WORK REQUESTS 10.5.2.1 IBA UNRELIABLE MULTICAST WORK REQUESTS ... A QP is not required to be attached to a Multicast Group in order to initiate an IBA Unreliable Multicast Work Request. Did I look in wrong place? Thanks
